That's a good thing, because there will be plenty of pressure on the 15-year-old amateur golfer from Beaverton on Thursday afternoon when she competes in the U.S. Women's Open at Blackwolf Run in Kohler, Wis.

"Pressure doesn't bother her. In fact, I think she feeds off it," Stoll's dad, Mike Stoll, said. "She's pretty much been through it all at a young age."

"I don't know if it's because she doesn't know any better because she's young or she just wants the ball when there's two seconds left," Lamberton said. "She is good under pressure."

Stoll, who will play in a pro-level event for the first time in her career, admits that she might be battling some butterflies when she tees up at hole No. 1 Thursday.

"I might get a little nervous," Stoll said. "I might hit my tee shot pretty far, just with all the adrenaline. I think after the first shot, I'll be feeling a lot better."

After that first shot lands, Stoll believes she'll be locked in mentally for a great round. Stoll will have plenty of support on every shot, with about 10 family members making the trip to cheer on the Beaverton High School sophomore-to-be.

Stoll believes she's playing her best golf entering the Open. Two weeks ago, she won medalist honors at the Oregon Women's Amateur and is confident she can continue her strong play.

"I've been hitting shots clean and really been able to strike the ball well," Stoll said. "And my putting, I've been working on my putting a lot, and having some issues, but I think getting used to these greens and hitting good putts -- if you make a good putt, you can make a lot of putts."

Putting will be a major focus this week for Stoll. After playing 12 practice holes Monday afternoon, Stoll realized one of the challenges of Blackwolf Run is the speed of the greens. She noted they are fast, so chipping will be critical.

"We're going to spend a lot of time chipping and pitching out of the rough," said Lamberton, who has coached Stoll for about three years. "I'd say in the last two weeks or so, she's been struggling a lot with her putting, so we're going to work a lot on putting."

Another obstacle of Blackwolf Run is its length, which Stoll said is pretty similar to Half Moon Bay (Calif.) Golf Links, where she qualified for the Open. For tournament play, Blackwolf Run has a total yardage of 6,954 yards. Stoll is impressed by hole No. 3, which at 455 yards is just a par-4.

"It's long," Stoll said. "It's long and the roughs are high, greens are fast and it's going to be one of the toughest golf courses I've ever played."

Lamberton, who is the director of instruction at Portland Golf Club, said the long course plays to Stoll's strengths.

"She's really strong and hits the ball hard," Lamberton said. "I'm not worried about the length so much, it's just the consistency."

Leading up to Thursday's first round, Lamberton worked with Stoll during practice rounds on her swing plane and keeping good tempo. Stoll knows she needs to play smart golf and let her ability take over.

"Mentally, just stay stable and just keep my head up no matter how I play because anything can happen," Stoll said.

Playing in the U.S. Women's Open is something Stoll has dreamed about since she was little. Accomplishing her dream at a young age makes everything that much more special.

"It's a big deal," Stoll said. "It's always been on my list of things to do. I didn't know it would be in the U.S. Open, but I've been wanting to play in LPGA tournaments for quite some time, trying to qualify. And qualifying for my first one at the U.S. Open's pretty incredible."

Just being one of 156 competitors in a major tournament is a big accomplishment, especially when Stoll is just one of five girls in the field who are 15 or younger.

Stoll has lofty goals for the Open. She wants to finish as the top amateur among the 28 competing, but she has an even bigger ambition.

"My goal right now is to make the cut," Stoll said. "If I can accomplish that, that will be satisfaction."

To make the cut and advance to play on the weekend, Stoll will have to finish in the top 60 after 36 holes.